Valve and valve-seat op steam-engines



UNITED STATES PATENT oFFicE- 'STEPHEN D. WILSON, or READING,PENNSYLVANIA;

VALVE AND VALVE-SEAT OF STEAM-ENGINES.

Specification of Letters Patent No. 10,417, dated January 10, 1854.

To all 'whom t may concern:

Be it known that I, STEPHEN D. WILSON, of the city of Reading, county ofBerks, and State of Pennsylvania, have invented a new and usefulImprovement on Steam-Ports in valve. Fig. 2 is a transverse section ofvalve and valve seat, and Fig. 3, is a surface view of the valve seat.

The nature of my invention consists in the enlargement and peculiarconstruction of the steam ports in the valve seat of steam engines, andin adapting the valve, to these ports, so as to exhaust steam from oneend of the cylinder with much greater rapidity than it is admitted intoit at the other, all of which is to be accomplished by the same motion,with a single slide valve and by this means diminish the resist-ance ofthe exhaust steam, and increase the power and speed of the engine with asaving of fuel.

To enable others skilled in the art to make and use my invention I willproceed to describe its construction and operation.

I construct my steam chest' in any of the known forms; represented herein Figs. 2 and 3, letter D; and on it place a slide valve A, Fig. 1. Imake no change in the form or size of the steam port G, in common use,leading from the cylinder to the seat of the steam chest until itreaches the seat; I then enlarge the port F, in the seat until it isequal in capacity to twice the steam port, Gr, and continue it at thissize to the surface of the seat of the steam chest, B, and E, in Figs. 2and 3. Imake my valve, A, Fig. 1, in any of the known forms, and moved,-too, by the common eccentric motion,-except that I alter the Shape ofthe valve so as to adapt it to the form of the openings in the seat. Ithen arrange my valve motion, so that it will open only one-half theport, F, for induction E, and the other half for eduction B, as myobject is to exhaust steam in the shortest possible time, so as torelieve the working of the engine from all resistance from this source;I shape on the face of the seat, D, Fig. 3, that portion ofthe openingAof the steam port, E, used for induction, as long in the direction ofthe stroke of the engine as'the steam chest will admit of and as narrowas possible to admit sufficient steam to .work the engine at its fullpower, and making the aperture, E, either straight, angular, orsemicircular as I may prefer. The other half, B, on the face of theseat, D, Fig 3,v

I L shape as long as the steam chest will admit of at right angles withthe length of the cylinder, or I may vary it by giving it a semicircularor angular figure such as B,

Fig. 3, and as narrow as possible, ust widen `ing it enough to make theeduction opening, B, equal in capacity to the induction opening, E.

By this construction of the ports I am able to exhaust the steam fromthe cylinder with an increased speed ust in the ratio the openl ing, B,bears to the opening, E, in a line parallel with the length of thecylinder, thereby dispensing with the necessity of givving-lead to theexhaust, saving the fuel force of the steam to the iinishing'ofthestroke; working the engine more by expansion, 'securing increase ofspeed and power andsaving fuel.

The exhaust port, C, Figs. 2 and 3, 'I make in the common formsufliciently large to conduct off the steam as fast as it escapesthrough the eduction port, B, and of a figure or shape to suit the otherportions of my seat, the valve, and itsl action. Ifdeemed expedient, inthe working of an engine, any amount of lead and lap may be given tothis valve without impairing in the least any of its advantages. a l

lVhat I claim as my invention and desire to secure by Letters Patent,is*

The enlargement and peculiar construction of the steam ports in thevalve seats of steam engines, B, E, and F, Figs. 2 and 3, and inadapting the valve, A, Fig. 1, Ato these ports, so as to exhaust thesteam, as herein described, using for that purpose the aforesaid shapeand figure, or any other substantially the same and which will producethe intended effect; and I hereby disclaim title to any originalinvention of the slide valve, valve seat, steam ports, eccen,

